<div class="btn-toolbar mb-2 mb-md-0">
    <div class="btn-group me-2">
        <a href="/admin/topic" type="button" class="btn btn-sm btn-outline-secondary">列表</a>
        <a href="/admin/topic/add" type="button" class="btn btn-sm btn-outline-secondary">添加</a>
    </div>
</div>
